What a neat archaeological mystery! How did they get there? Trade? Slavery? The robust trade between the Chinese and the Roman Empires resulted in a lot of cultural and diplomatic exchanges. Heck, the Chinese wrote an entire account about their travel to the Rome. Here's more from the recent findings:
Despite the trade between the empires, however, only one person of Asian ancestry has ever been found on sites dating back to the Roman Empire – an adult man unearthed at Vagnari in Italy.But now research led by the Museum of London has revealed two more individuals of Asian ancestry, buried among the remains of other citizens of ancient Londinium.
I cannot wait for what they'll find next. Brave new (old) world, peoples.